Auxiliary heating device for furnaces.



E. T. MARSH. AUXILIARY HEATING DEVICE FOR FURNACES.

APPLICATION FILED JUNE 2, 1909.

937,624. Patented Oct.19,1909.

UNITED STATES PATENT OFFICE.

EDWIN '1. MARSH OF ROCHESTER, NEW YORK.

AUXILIARY HEATING DEVICE FOR FURNACES.

Application filed June 2, 1909.

To all whom it may concern:

Be it known that I, EDWIN T. MARSH, a citizen of the United States,residing at Rochester, in the county of Monroe and State of New York,have invented certain new and useful Improvements in Auxiliary HeatingDevices for Furnaces; and I do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to an auxiliary heating device for hot air orsteam furnaces, and has for its object to provide a device of this kindwhich may be heated by the products of combustion passing out of thesmoke stack, and which may in turn heat the surrounding air and conductthe air thus heated to a suitable point.

The object of my invention is to provide for the utilization of theproducts of combustion as a heating medium and thus utilize the heatwhich is usually carried away with the products of combustion and goesto waste.

With the foregoing and other objects in view, the invention consists ofcertain novel features of construction, combination and arrangement ofparts, as will be more fully described and particularly pointed out inthe appended claim.

In the accompanying drawings: Figure 1 is a plan view of the auxiliaryheating device, showing the hot air pipe leading from the top of thecasing. Fig. 2 is a similar View of another form of the device showing adifferent arrangement of the hot air pipe; Fig. 3 is an inverted planview of Fig. 1, with the bottom plate removed, showing the interiorarrangement of the heating pipes; and Fig. 4 is a vertical transversesection taken on the line 44 of Fig. 1.

Referring to the drawings for a more particular description of theinvention, the device comprises a casing 1, provided with the removablebottom plate 2. An inlet pipe 3, extends through the side of the casingand into the interior thereof,.and is connected with the pipe 4, whichin turn is connected by means of the coupling 5 with a similar parallelpipe 6. An outlet pipe 7, leads from the pipe 6, through the side of thecasing at a point immediately adjacent the outer end of the inlet pipe3. The inlet pipe 3, is connected with the smoke flue or stack of thefurnace by the coupling and pipe 9 and 8,

Specification of Letters Patent.

Patented Oct. 19, 1909.

Seria1-No. 499,621.

respectively, while the adjacent end of the opposite pipe 7, isconnected with the chimney by means of the pipe 10. When the auxiliaryheater is used in connection with furnaces, where the heating pipesspring from the sides of the hot air jacket, the device is mounted uponthe top of the furnace jacket with the cover plate removed.

With furnaces built with the hot water pipes springing from the top ofthe furnace jacket, the device is suspended by straps 14, from the floorjoists or from any suitable support above the furnace. In such cases,the bottom plate may or may not be removed. The hot air pipe 11, mayextend from the top of the casing as shown in Figs. 1, 3 and 4 or fromone side of the casing as shown in Fig. 2. The fresh air is admittedinto the interior of the casing by means of the fresh air pipe 12, whichextends from one side of the casing in both forms ofthe invention. Theouter ends of the pipes 4 and 6 project beyond the adjacent side of thecasing and are provided with removable caps 15, which may be removedfrom position to enable the various pipes to be cleaned.

A pivotal damper 16, is arranged in the coupling 9, between the outerends of the inlet and outlet pipes, 3 and 7 respectively and is for thepurpose of causing a direct draft from the fire to the chimney when thefire is low or if for any other reasons a stronger draft is required.This damper may be controlled from the upper floors by the usual chainand pulley attachment.

From the foregoing description taken in connection with the accompanyingdrawings, the construction and operation of the invention will bereadily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advantages of the invention, as defined in theappended claim.

Having thus described my invention, what I claim is An auxiliary heatingdevice for furnaces comprising a casing, a fresh air pipe communicatingwith the interior thereof, a conduit for leading the products ofcombustion passing out of the smoke-stack through the casing in a zigzagor indirect course, said conduit comprising a pair of oppositelydisposed inlet and outlet pipes and a pair of in said coupling tocontrol the course of the products of combustion through the casing,

and a hot air pipe for leading the heated 10 fresh air from the casingto a suitable point, i In testimony whereof I havehereunto set my handin presence of two subscribing witnesses.

EDWIN T; MARSH. Witnesses ESTHER E. MARSH, RUTH M. ABKARIANL

